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탄소섬유시트와 비좌굴 가새로 보강한 기둥의 횡방향 거동평가를 위한 실험적 연구
서상훈(Seo Sang-Hoon),유연종(Yoo Youn-Jong),이영학(Lee Young-Hak),김희철(Kim Hee-Cheul),이한선(Lee Han-Seon),이기학(Lee Ki-Hak) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
The purpose of this study aims to examine flexural behavior of beam-column specimen retrofitted by CFRP sheet and BRE (Buckling-Restrained Brace) under constant axial and cyclic lateral loads. Three specimens were made with different retrofitting methods: CFRP sheets only and CFRP sheet and BRB systems. Load and displacement capacity was evaluated by comparing load-displacement relations. Lateral load resistant capacities were estimated in terms of the effective stiffness.
서상훈(Sanghoon Seo),권혁률(Hyukryul Kwon),이창하(Changha Lee),박용선(Yongsun Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The interest in the environmental matter and petroleum resources has rapidly increased. The importance of fuel cell system has been studied, and many subsystems for fuel cell must be engineered to support electrical power, to install a fuel cell into a vehicle platform. Especially, it is important to support a high performance air process system, to produce a stable electric power. For the competitive air process system(APS), the APS need to be smaller, highly efficient, and a low noise level system. The noise from APS has badly influenced on comfortable ride, in fuel cell vehicle. In this report, the results of air intake noise test and the countermeasure of noise problem of fuel cell vehicle are described.
나노 금속잉크의 미세 액적 토출을 이용한 마이크로 패터닝
서상훈(S. H. Seo),박성준(S. J. Park),정현철(H. C. Jung),정재우(J. W. Joung) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Inkjet printing is a non-contact and direct writing associated with a computer. In the industrial field, there have been many efforts to utilize the inkjet printing as a new way of manufacturing, especially for electronic devices. For the application of inkjet printing to electronic field, one of the key factors is exact realization of designed images into printed patterns. In this work, micro patterning for conducting line has been studied using the piezoelectric print head and silver nano ink. Dimensions of printed images have been predicted in terms of print resolution and diameter of a single dot. The predicted and the measured values showed consistent results. Using the results, the design capability for industrial inkjet printing could be achieved.
잉크젯 프린팅 기술을 이용한 나노 금속잉크의 인쇄회로기판용 미세배선 형성
서상훈(Shanghoon Seo),박성준(Sung-Jun Park),정재우(Jaewoo Joung) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.5
Inkjet printing has become one of the most attractive manufacturing techniques in industry. Especially inkjet printing technology will soon be part of the PCB (Printed Circuit Board) fabrication processes. Traditional printing on PCB includes screen printing and photolithography. These technologies involve high costs, time-consuming procedures and several process steps. However, by inkjet technology manufacturing time and production costs can be reduced, and procedures can be more efficient. PCB manufacturers therefore willingly accept this inkjet technology to the PCB industry, and are quickly shifting from conventional to inkjet printing. To produce the printed circuit board by the inkjet technology, it must be harmonized with conductive nano ink, printing process, system, and inkjet printhead. In this study, micro patterning of conductive line has been investigated using the piezoelectric printhead driven by a bipolar voltage signal is used to dispense 20-40 urn diameter droplets and silver nano ink which consists of 1 to 50 nm silver particles that are homogeneously suspended in an organic carrier. To fabricate a conductive line used in PCB with high precision, a printed line width was calculated and compared with printing results.
Polycarbonate/Metal Salt 막의 산소분리특성에 미치는 비용매와 금속염 농도의 영향
서상훈(Sang-Hun Seo),이우태(Woo-Tai Lee) 한국산업융합학회 2001 한국산업융합학회 논문집 Vol.4 No.1
Polycarbonate(PC) membranes for oxygen enrichment from air were prepared by the wet phase inversion method. In order to improve oxygen separation performances of the PC membrane, the effect of the added ethanol(nonsolvent) and CuCl₂(metal salt) concentration in the casting solution on morphology, oxygen permeability ami O₂/N₂ separation factor of the membrane was studied. In addition, tensile strength and elongation at break of the membrane were investigated. An asymmetric membrane with a dense top layer and a porous sublayer was obtained. The thickness of the dense top layer decreased with increasing amount of nonsolvent additive. Compared with pure PC membrane without additive(metal salt), the oxygen permeability and O₂/N₂ separation factor of the PC/CuCl₂ membrane arc significantly improved. The oxygen permeability and O₂/N₂ separation factor is 5.25×10??㎤(STP)·㎝/㎠·sec·㎝Hg and 4.5, respectively. This improvement might be due to good interaction between metal salt and oxygen.<br/> <br/>
고성능 낙석ㆍ토석 대책시설용 에너지 감쇄장치 개발 연구
서상훈(Seo, Sanghoon),최민형(Choi, MinHyong) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.6
본 연구에서는 100% 해외 기술이 적용되고 있는 고성능 낙석방지울타리 및 토석류 대책시설용 링형네트 시스템의 국산화를위하여 링형네트 시스템의 주요 구성요소인 에너지 감쇄장치 개발연구를 수행하였다. 개발된 에너지 감쇄장치는 파이프가2개의 강봉을 통과하며 발생하는 저항력과 마찰력, 파이프 변형을 활용하여 전달되는 인장력을 감쇄시키는 구조로 개발되었다. 개발된 에너지 감쇄장치는 시뮬레이션 분석과 실물인장시험을 통해 그 성능을 검증하였으며, 가장 효과적인 D60.5-3.2t 파이프와롤링 간격 40 mm로 구성된 감쇄장치는 52.8~60.2 kJ/m의 감쇄성능을 갖는 것으로 확인되었다. In this study on the development of energy-dissipating devices, a significant component of the ring-net system was investigated for the localization of a high-performance rockfall fence and debris flow barriers. The energy-dissipating device was developed as a structure that dissipated the resistance and frictional forces generated by the pipe passing through two steel bars, and the tensile force was transmitted by utilizing the pipe deformation. The performance of the developed energy-dissipating device was verified through simulation analysis and tensile tests. It was confirmed that the most effective dissipating device was made of a D60.5-3.2t pipe subjected to a rolling interval of 40 mm, and the device exhibited an energy-dissipating performance of 52.8-60.2 kJ/m.
2,040 MPa급 고강도 강선을 활용한 고성능 낙석·토석 대책시설용 링형 포획망 개발 연구
서상훈(Seo, Sanghoon),최민형(Choi, MinHyong) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.6
본 연구에서는 100% 해외 기술이 적용되고 있는 고성능 낙석방지울타리 및 토석류 대책시설용 Ring-Net 시스템의 국산화를위하여 Ring-Net System의 주요 구성요소인 링형 포획망 개발연구를 수행하였다. 개발된 링형 포획망은 직경 2.8 mm의 2,040 MPa급 고강도 강선을 활용하여 제작되었으며, 시뮬레이션과 실물성능시험을 통해 성능을 검증하였다. 그 결과 개발된7~19/2.8/300 링형 포획망의 3-Ring 파단하중은 79.8~329.0 kN, 3-Ring의 에너지 저감능력은 2.9~8.7 kJ로 분석되었으며, 기존직경 3.0 mm의 1,770 MPa급 강선으로 제작되는 링형 포획망의 성능과 대등한 것으로 분석되었다. 그러나 기존 기술대비약 13% 저감된 자중으로 제작할 수 있기 때문에 고성능 낙석방지울타리의 경량화 및 시공성 향상에 유리할 것으로 판단된다. In this study, research was conducted on the development of Ring-Net, a major component of the Ring-Net System for the localization of a high-level debris-flow barrier, which is fully applied with foreign technology. Ring-Net was constructed using the 2,040 MPa class high-strength steel wire with a 2.8 mm diameter,. Its performance was verified through simulation and a 3-Ring Test (ETAG 027). As a result, the 3-Ring breaking load of 7-19/2.8/300 Ring-Net was analyzed to be 79.8-329.0 kN. The 3-Ring energy dissipating capacity was 2.9-8.7 kJ, which is equivalent to the performance of the Ring-Net made of 1,770 MPa class wires with a 3.0 mm diameter. However, since it can be manufactured with a 13% weight reduction compared to the existing technology, it is believed to be advantageous for lightening the high-level Rockfall & Debris Barrier and improving its construction capability.